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Which unit is commonly used for the density of a liquid?

1. Ag·mL
2. Bkg
3. CmL/g
4. Dg/mL

What does the rule "like dissolves like" mean?

1. APolar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones
2. BSolids dissolve only in other solids
3. COnly substances with identical formulas can ever dissolve in each other
4. DEvery substance dissolves in water

What is absolute zero?

1. A0 °C, the point at which pure water freezes into ice
2. B0 °F, the temperature of a salt and ice mixture
3. C0 K, about −273 °C, the lowest possible temperature
4. D−100 °C, the coldest temperature on Earth

Which substance is a non-electrolyte when dissolved in water?

1. AHydrochloric acid
2. BGlucose
3. CPotassium chloride
4. DSodium chloride

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. ANone of the salt dissolves
2. BAll 50 g dissolves
3. CAbout 36 g dissolves and about 14 g stays undissolved
4. DAbout 14 g dissolves and about 36 g stays undissolved

An exothermic reaction is at equilibrium. What happens if the temperature is raised?

1. AThe equilibrium shifts toward the reactants
2. BThe equilibrium does not change
3. CThe equilibrium shifts toward the products, raising the yield
4. DThe reaction becomes endothermic

J.J. Thomson's cathode ray experiments led to which discovery?

1. AElectrons occupy fixed energy levels
2. BThe nucleus contains uncharged neutrons
3. CAtoms have a dense, positively charged nucleus
4. DAtoms contain small, negatively charged particles

Why does a burn from steam at 100 °C usually cause more damage than one from liquid water at 100 °C?

1. ASteam particles are hotter than water particles at the same reading
2. BSteam carries dissolved acid that damages the skin
3. CSteam releases a large amount of extra energy as it condenses on the skin
4. DLiquid water cannot pass any of its heat to the skin